yarnell



(No Model.) 2 Sheets-Sheen;- 1.

O. S. YARNELL'.` RUBBING 0R POLISHING MACHINE.

" No.` 528,199. Patented om. so, 1994;

UNITED STATES `PATENT Unsinn.

cHARLEss. YARNELL, on MINNEAPOLIS, MINNESOTA, AssIeNon To THE MOOREoARvINer MACHINE COMPANY, on sA'ME PLAGE.

RUBBING OR POLISHING MACHINE.

SPECIFICATION forming part of Letters Patent No. 528,199, dated October30, 1894.

j Application flledDecember 8, 1893. Serial No. 493,086. (No model.)

To @ZZ whom it may concern:

Be .it known that I, CHARLES S. YARNELL, of Minneapolis, in the countyof Hennepin and State of Minnesota, have invented a new and usefulImprovement in Rubbing or Pol- Ishing Machines, of which the followingis a description, reference being had to the accompanying drawings,which are a part of this specification.

The object of my invention is to provide means, in a polishing machinehavinga horizontally reciprocating bnffercarriage, for mounting andadapting thereto an attached buffer or polisher for bufflng or polishingcurved, oblique or undulating surfaces.

My Improved devices are especially adapted for use in a polishingmachine of the character illustrated and described in Patent No.`507,280, issued October 24, 1893. i

The invention consists in the devices and4 their parts and combinationsas herein descrlbed and claimed, or their equivalents. i

In the drawings, Figure 1, is an elevation of my improved devices, inconnection with a fragment of the guide-bar of a polishing machine, onwhich the improved devices are mounted, and a pattern or guide, and afragment of the article being polished. Fig. 2, is a top plan View of myimproved devices and of a fragment of the guide-bar of a polishingmachine. Fig. 3, is a transverse section of the devices on line 3-3 ofFig. 2 looking toward the left. Fig. 4, is a transverse section of thedevices, taken on line 4 4 of Fig."2 looking toward the left. Fig. 5, isaside view of the buffer and its connections to the arm on which it ismounted, parts being shown in section for convenience of illustration.-Fig. 6, is a end view of the buer and its connections to the arm onwhich it is mounted.

In the drawings, A is thehorizontally disposed guide-bar of a polishingmachine, which is preferably so attached` to the machine as to becapable of being moved or swung ver tically and horizontally limitedly.A buffercarriage 10, loose on the guide-barA is reciprocative thereon bysuitable mechanism, to which it is connected` by the rod 11. Thiscarriage, is for the purposes of myimproved devices, conveniently in theform of end rings 12, 12 connected together rigidly by top and bottombars 13, 13. Brasses 15 in the carriage serve as bearings for thecarriage on the guide-bar, and a feather 14 on one of the brasses,enters a longitudinal slot thereforin the bar, and prevents rotarymotion of the carriage on the bar.

For mounting my improved devices for carrying the buffer, on thecarriage 10, a plate 16 forming the body of a frame is secured 6oadjustably to the carriage 10, advisably by means of lugs 17, projectinglaterally therefrom, alongside the endsorouter faces of the rings 12,and holding screws 18 turning through the lugs into an annular groove 1965 therefor in the end surfaces of the rings. By this construction theframe 16 may be adjusted -circumferentially of the carriage, if desired,although such adjustment in practi- Y cal use, will rarely if ever berequired. A 7o finger 2O projecting laterally from the plate 16 isadapted, when the frame is to be in the vertical normal position shownin the drawings (which is the one in which it is most commonly used),tobear against the carriage 10 medially, and thus serve` as a gage toadjust the parts and thereafter to strengthen` them relative to eachother.

An arm 21 is pivoted` at its extremity, con.` veniently by a pivot 22,to the plate 16, so as 8o to swing from and toward the substantially Yhorizontal planeof reciprocation of the oarriage, and at its otherextremity carries the buffer 23 mounted thereon. The buffer 23 may be ofany suitable material, for the purpose of rubbing the article to bepolished, and in the drawings is represented as, and must be understoodto be a thick piece or block of felt secured to a steel or other elasticplate or back 24, which is secured de- 9o tachably and movablylimitedly, to the buer block 25 by means of screws 26, 26. Thebilder-block 25 is secureddetachably to the head-block 27 which inturnis attached to the arm 21 tiltably in the projection of 95 the plan ofthe swinging movement of the arm, by a bolt 28. A pin 29 fixed in thehead-block 27 enters a slot 29 in the arm 2l, and prevents revolublemotion horizontally of the block 27 on the arm. To provide for Ioo acertain amount of bending or curving of the flexible block 23 and plate24, by which it conforms to the uneven, corrugated or irreg-l ular curveofa surface being polished, there are two rounded or conical bosses 30,30 on the surface of the bulenblock 25, the outer extremities of whichserve for bearings for the buffer-block 24, and into and through whichthe screws 26, 26 pass. A slot 31 in the plate 24 through which thescrew 26 passes, provides for the movement of the plate 24, thereabout,when, in conforming to the irregular surface of the article being polnished, the block 23 and plate 24 are forced into concave or convex form.On the free extremity of the arm 21, on which the buffer is mounted, andsubstantially opposite thereto, I provide a bearing, preferably a Wheel32, mounted in the arm 21, which is adapted to bear against and beguided by a pattern B, which is of the same form, on this bearingsurface, and is disposed in a similar position as the surface oppositethereto of the article C to be polished. The pattern B is convenientlysupported, by being attached to a collar 33 adjustable on the guide-barA and held thereto releasably by the set screw 34. The pattern or guideB is so located and arranged with reference to the article C, as bymeans of the bearing 32, to hold the buffer 23 constantly to its work onthe surface of the article C, being polished.

A spring 35 fixed at one extremity to the frame 16, conveniently by ablock 36, in which the end of the springis inserted, is attached at itsother extremity to the arm 2l, and is adapted to counterpoise or supportthe arm 21 substantially horizontally. An inverted substantiallyU-shaped yoke 37 rigid on the frame 16 serves as a guide for the arm 2l,permitting vertical movement thereof but preventing lateral movement. Astop 38 projecting from the arm 21 under the end of the carriage 10, isadapted to engage therewith and prevent the further upward movement ofthe arm. This stop 38 is so constructed and arranged as to engage thecarriage 10 at the same moment that the arm 2l, moving upwardly, comesto the upper limit of its travel in the yoke 37. A stop 39 xed on theframe 16 and projecting therefrom beneath and across the path of the arm21 prevents undue downward movement thereof.

Having' thus described my invention, what I claim, and desire to secureby Letters Patent, is-

1. In a polishing machine, the combination with a straight guide bar, ofa carriage reciprocative on the guide bar, a single swinging arm pivotedon the carriage so as to swing toward and from a plane through the axisof the guide bar, and a buifer pivoted on the free extremity oftheswinging arm in such manner as to be tiltable to oblique positionswith reference to the arm and to the guide bar in or parallel to theprojection of the swinging movement of the arm, whereby the buffer isadapted when reciprooated by the reciprocation of the carriage to followand polish the surface of material diverging or curving from the line ofreciprocation of the carriage, substantially as described.

2. In a polishing machine, the combination with a carriage reciprocativeon a guide-bar, of a swinging arm pivoted on the carriage, a buffermounted on the free extremity of the swinging arm, a bearing also on thefree extremity of the buier-oarrying arm, and a pattern or guide ofsubstantially the same form as and disposed opposite and in asimilarposition to the article to be polished and so as by controlling themovement of the arm by its bearing, to hold the buffer up to its work onthe surface of the article being polished, substantially as described.

3. In a polishing machine, the combination with a carriage reciprocativeon aguide-bar, of a swinging arm pivoted on the carriage, a buiiermounted on the free extremity of the swinging arm, and a spring securedto the carriage and attached to the arm, adapted to counterpoise thearm, substantially as described.

4. In a polishing machine, the combination, with a carriagereciprocativeonthe guide-bar, of a swinging arm pivoted on the carriage, a buffermounted on the free extremity of the swinging arm, and a guide securedto the carriage, in which the swinging arm moves.

vertically, adapted to prevent lateral movement of the arm,substantially as described.

5. In a polishing machine, the combination with a carriage reciprocativeon a guide-bar, of a swinging arm pivoted on the carriage. a buermounted on the free extremity of the swinging arm, and stops adapted tolimit the movement of the swinging arm vertically, substantially asdescribed.

6. In a polishing machine, the combination of a carriage reciprocativebut non-revoluble on a guide-bar, a frame 16 secured adjustablycircumferentially on the carriage, and a swinging buffercarrying armpivoted on the frame, substantially as described.

'7. In a polishing machine, the combination with a carriagereciprocative on a guide bar, a swinging arm pivoted on the carriage,and a buffer-block mounted on the swinging arm, said buffer-block beingprovided with bosses, of an elastic buffer bearing against the bossesand secured thereto and to the buffer-block with limited freedom so asto be capable of bending into concave or convex positions in conformityto the article being polished, substantially as described.

In testimony whereof I afx my signature in presence of two Witnesses.

CHARLES S. YARNELL.

Witnesses:

CHARLES G. VAN WERT, L. A. CONDIT.

lIO

It is herebyfoertied that in Letters Patent No. 528,199, granted October80, 1894, l upon the applicationwof Charles S. Yarnell, of Minneapolis,Minnesota, for an improvement in Rnbbing or Polishing Machines, an errorappears in the printed specification reqniringthe following correction,viz: In line 96, page 1, the Word plan7 should read plane,- and that thesaid Letters Patent should be read with this correction therein that thesame may conform to the record of thecase in the Patent Office.

Signed, countersigned, and sealed this 13th day of November, A. D. 1894.

[SEAL] J N O. M. REYNOLDS,

Assistant Secretary of the Interior. Gonntersigned:

JOHN S. SnYMoUR,

Oomim'ssz'oneiA of Patents.

